HVAC filter



FIG. 1 is a perspective view of an HVAC filter showing our new design;

FIG. 2 is a front view thereof, the rear view thereof being the same;

FIG. 3 is a top view thereof, the bottom view thereof being the same; and,

FIG. 4 is a side view thereof, the other side thereof being the same. 

The ornamental design for an HVAC filter, as shown and described. 